Note 7 - Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021			2020
Dividend yield		0	%		0	%		0	%		0	%
Expected life (years)		4.8			4.9			4.8			4.9
Expected volatility		105	%		63	%		105	%		63	%
Risk-free interest rate		0.6	%		0.3	%		0.5	%		0.7	%

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Cost of revenue — Edge to Cloud	$	9	$	20	$	24	$	24
Selling, general and administrative		181		80		327		286
Research and development		20		5		27		10
Total stock-based compensation expense	$	210	$	105	$	378	$	320

Share-based Payment Arrangement, Option, Activity [Table Text Block]

						Weighted
						Average
						Remaining
				Weighted		Contractual
	Number of			Average		Life		Aggregate
	Shares			Exercise Price		(in years)		Intrinsic Value
Balance at December 31, 2020		1,786,891		$	2.04		7.75	$	330,831
Granted		160,000			2.89
Exercised		(24,255	)		2.20
Forfeited		(43,450	)		1.51
Expired		(62,200	)		2.60
Balance at June 30, 2021		1,816,986			2.11		7.49		4,987,776
Vested and expected to vest at June 30, 2021		1,670,128			2.15		7.39		4,527,651
Exercisable at June 30, 2021		860,520		$	2.67		6.36	$	1,957,927

Schedule of Share Based Compensation Additional Stock Options Activity [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Weighted average grant-date fair value of options granted during the period	$	2.64	$	1.66	$	2.89	$	1.02
Options in-the-money (in shares)		706,620		25,344		706,620		25,344
Aggregate intrinsic value of options exercised during the period	$	1.02	$	—	$	2.20	$	—

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

	Number of			Weighted Average
	Shares			Award Price
Unvested at December 31, 2020		164,697		$	1.48
Granted		90,343			2.72
Vested		(109,798	)		1.48
Forfeited		(21,115	)		1.48
Unvested at June 30, 2021		124,127			2.38
Expected to vest after June 30, 2021		118,839		$	2.37

Schedule of Common Stock Reserved For Future Issuance [Table Text Block]

	June 30, 2021
Stock options outstanding		1,816,986
Restricted stock units and performance stock units outstanding		624,127
Stock options and restricted stock units available for future grant		1,426,792
Common stock reserved for future issuance		3,867,905